Sewing machine full and low bobbin indicator

Details Sewing machine full and low bobbin indicator Sewing machine full and low bobbin indicator

1979-07-05

1980-07-15

Nerbun, Peter P.

Sewing

Elements

Thread sensing

D05B 4500

Patent

active

042122570

ABSTRACT:
A bobbin alarm for a sewing machine which utilizes a light source and a pair of light sensors to provide a warning of low bobbin thread remaining or of a full bobbin condition. The light sensors are arranged with respect to the light source so that one sensor lies substantially on a line from the light source tangent to the hub of the bobbin and the other sensor lies substantially on a line from the light source tangent to the periphery of an imaginary cylinder having the bobbin flanges as the ends thereof. A circuit is provided which is responsive to light stimulation of both sensors (empty bobbin condition) or no stimulation of both sensors (full bobbin condition) to provide a signal to an operator in the form of an illuminated LED.

REFERENCES:
patent: 3082968 (1963-03-01), Reichelt et al.
patent: 3138127 (1964-06-01), Ketterer
patent: 3599586 (1971-08-01), Newman
patent: 3845320 (1974-10-01), Winberg

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